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QQuickWidget中文输入法问题的正确解法
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        <h1 id="QQuickWidget中文输入法问题的正确解法">
            
            QQuickWidget中文输入法问题的正确解法
            
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<li><a href="#qquickwidget中文输入法问题的正确解法">QQuickWidget中文输入法问题的正确解法</a><ul>
<li><a href="#qt的bug">Qt的bug</a></li>
<li><a href="#旧的解法">旧的解法</a></li>
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<h1 id="QQuickWidget中文输入法问题的正确解法"><a href="#QQuickWidget中文输入法问题的正确解法" class="headerlink" title="QQuickWidget中文输入法问题的正确解法"></a>QQuickWidget中文输入法问题的正确解法</h1><p>本文分享特定问题的解法,用不到的可以忽略。</p>
<h2 id="Qt的bug"><a href="#Qt的bug" class="headerlink" title="Qt的bug"></a>Qt的bug</h2><p>使用QQuickWidget的时候，遇到过这个问题：界面的TextInput 或者TextEdit, 鼠标点击聚焦后，切换为光标输入状态，此时切换系统中文输入法，会发现无法输入。</p>
<p>(系统任务栏的输入法状态是正确的,界面上输入字符，直接显示英文，无法显示输入法的候选框)</p>
<p>需要把界面切到其它软件，再切换回来，之后就能够输入了。</p>
<p>可以参考Qt官方bug报告:</p>
<p><a href="https://bugreports.qt.io/browse/QTBUG-61475" target="_blank" rel="noopener">https://bugreports.qt.io/browse/QTBUG-61475</a></p>
<h2 id="旧的解法"><a href="#旧的解法" class="headerlink" title="旧的解法"></a>旧的解法</h2><p>这个Bug是2018年报告的，我们当时做项目，也被这个Bug坑到了。</p>
<p>当时我给出了一个弱化版本的解法，原理是在第一次聚焦的时候，清理掉QQuickWidget的焦点。</p>
<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">QuickWidget::QuickWidget(QWidget *parent)</span><br><span class="line">    : QQuickWidget(parent)</span><br><span class="line">&#123;</span><br><span class="line">    ...</span><br><span class="line">    connect(quickWindow(), &amp;QQuickWindow::activeFocusItemChanged, <span class="keyword">this</span>, &amp;QuickWidget::onClearFocus);</span><br><span class="line">    ...</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">void</span> QuickWidget::onClearFocus()</span><br><span class="line">&#123;</span><br><span class="line">    QQuickItem *pItem = quickWindow()-&gt;activeFocusItem();</span><br><span class="line">    <span class="keyword">if</span> (pItem &amp;&amp; (pItem-&gt;inherits(<span class="string">"QQuickTextInput"</span>) || pItem-&gt;inherits(<span class="string">"QQuickTextField"</span>))) </span><br><span class="line">    &#123;</span><br><span class="line">        disconnect(quickWindow(), &amp;QQuickWindow::activeFocusItemChanged, <span class="keyword">this</span>, &amp;QuickWidget::onClearFocus);</span><br><span class="line">        QuickWidget::clearFocus();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>此方法勉强能用，一些细节上体验不太好。</p>
<p>当时找不到更好的方法，就这样用着了。</p>
<h2 id="正确的解法"><a href="#正确的解法" class="headerlink" title="正确的解法"></a>正确的解法</h2><p>2020年Qt官方终于派出了资深的专家，在Qt5.15.2中，彻底解决了这个问题。</p>
<p>(看到有不少博客、论坛，还在流传我提供的旧版本，于心不忍)</p>
<p>于是我从新版本里面，提炼出来了代码，给使用旧版本的同学解决此问题。</p>
<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line">QuickWidget::QuickWidget(QWidget *parent)</span><br><span class="line">    : QQuickWidget(parent)</span><br><span class="line">&#123;</span><br><span class="line">  ...</span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">if</span> QT_VERSION &lt; QT_VERSION_CHECK(5, 15, 2)</span></span><br><span class="line">    connect(quickWindow(), &amp;QQuickWindow::focusObjectChanged, <span class="keyword">this</span>, &amp;QuickWidget::propagateFocusObjectChanged);</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line">  </span><br><span class="line">  ...</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">if</span> QT_VERSION &lt; QT_VERSION_CHECK(5, 15, 2)</span></span><br><span class="line"><span class="keyword">bool</span> QuickWidget::event(QEvent *e)</span><br><span class="line">&#123;</span><br><span class="line">    <span class="keyword">switch</span> (e-&gt;type())</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">case</span> QEvent::FocusAboutToChange:</span><br><span class="line">            <span class="keyword">return</span> QCoreApplication::sendEvent(quickWindow(), e);</span><br><span class="line">        <span class="keyword">default</span>:</span><br><span class="line">            <span class="keyword">break</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> Super::event(e);</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">void</span> QuickWidget::propagateFocusObjectChanged(QObject *focusObject)</span><br><span class="line">&#123;</span><br><span class="line">    <span class="keyword">if</span> (QApplication::focusObject() != <span class="keyword">this</span>)</span><br><span class="line">        <span class="keyword">return</span>;</span><br><span class="line">    <span class="keyword">if</span> (<span class="keyword">this</span>-&gt;window()-&gt;windowHandle()) &#123;</span><br><span class="line">        emit <span class="keyword">this</span>-&gt;window()-&gt;windowHandle()-&gt;focusObjectChanged(focusObject);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br></pre></td></tr></table></figure>
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